... ~800°C, intake valve 300~500°CEngine valve head with customer logoEngine valve pole platingEngine valve treatment nitriding, hard surfacingEngine valve use thermostability, stand wear ... , sprocket, bearing, wheel, tires, rims, and others.Engine partsCylinder block, cylinder head, crankshaft, camshaft, piston, piston ring, magneto, clutch, paper gasket ...